Furnace



E. FITTS.

FURNACE. APPMCAUON FILED MAY21.1916.

Patented Feb. 3,1920.

33M WWW/Mmmm @Miou/swag latter being preferably porting the protectingblocks for the air UNITED STATES PATENT oEEIoE.

Vof which the following is To all uzom t may concern.

Be it known that I, EDwIX F rrrs, a citizen of the United States of ingat Detroit, in the county .o f 'ayneand State of Michigan, have inventedcertain new and useful Improvements` in Furnaces, a specification,reference being had therein to the accontipanying drawings.

This invention relates to furnaces and refers more particularly toimprovements in furnaces of the type which are provided with side feedstokeis.

In 'some furnaces ,of this general class a fiat arch member is 'employedand it is among the objects of the invention to provide a new andimproved arrangement for supporting the flat arch member. Other objectsofthe invention are to vprovide a construction in which the arch memberis supported on, the stoker side plate, the

constructed in sections so that the height of the arch niember can bevaried in accordance with the size and shape of the furnace,- to providea construction in which this extension feature is maintained whilepermitting of a standardizedlower section for the side plate, thuspermitting the use of the same lower section for various sizes offurnaces; to provide an improved construction for suptwyers'; to providea construction in which there is a verticalfwall arrangement forprotecting the fairtwyers and side plates from Athe heatv of thefurnace, this wall being preferablyl also supported from the stoker sideplate; to providea construction in which the 'protecting blocks areindepe'ndently removablefor repair or renewal but vin which vthe blocksare-.locked from displacement when in use and normally held in verticalalineinentwith the inner face of the remainder of' the vertical sidewall;

to provide a novel construction and mounting for the upper covering orroof of the arch. and in general to provide an improved furnaceconstruction of the character above referred to.

The invention further resides in various' features of construction andsuch arrange-` ments and combinations of parts as will more fullyhereinafter appear.

In the drawings:

Figure l is a partial vertical cross sec- Anierica, resid- .ing theEDWIN FITTS, 0F DETROIT, MICHIGAN. ASSIGNOR TO DETROIT lSTOKLEB,COMPANY, 0F

. DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN. 4

I FURNA'CE.

1,329,891. Specification of Letters Patent. Patented Feb, 3, 1920.

Application led Hay 27, 1916. Serial No. 100,412.

tionthrough a furnace embodying my invention;

Fig. 2 is a vertical sectional view taken at right angles to 1centrally'through one of the hangers.

Describing in detail the particular embodiment of my invention shown inthe drawings, A designates one of the inclined grates of the furnace, Bthe combustion chamber and C the refractory arch formtop ofthecombustion chamber. This arch is ofthe type known as Hat arch formed ofa plurality of rows of blocks C, C2, etc., supported from I-beams D bymeans of cross beams D and h rs D2. At the lower ends the ha rs D2 haveyokes D3 to which are secured y bolts D, the cross beams D', the heads Eof which lit-,in grooves E2 in the arch blocks so that the latter aresuspended from the I-beams D. In connection with this type of furnacethere is at the side of the combustion chamber a fuel'magazine F fromwhich the fuel is fed to the combustion chamber by stokers F. The innerwall or side plate G of this fuel magazine is'lutilized as a supportingwall for the ends of the arch supporting beams D, and in addition tosupporting the arch. the side plate is in the present constructionutilized for carrying a protecting wall H. The latter is preferablyvertically arranged and is `spaced from the side plate to provide apassage H which forms al connection between the air twyer members I andthe air space H2 above the arch. In turn. ther air twyers are providedwith a series of protecting blocks I so arranged that their inner facesform substantially a continuation of the inner face of the vertical wallH.

he air twyer members I are preferably formed of a plurality of sectionsI2 of cast metal. each section having an inclined bottoni I3 andvertical ribs It The connection between these sections and the sideplate is formed by hook members J on the twver sections. which engagesockets JV on the .side plate G. The support for the vertical wall Hcomprises a plate member M which extends across and rests upon the topsurfaces of the inwardly extending ribs L. The latterare preferably castintegral with the lower section of the side platec'these ribs beingspaced a suitable distance apart.

For holding the refractory blocks I in aline'ment the blocks areprovided with re-v cesses M2 whichl register with openings M' tlie'ribsL.

A locking rod 'X extends through the iecesses M2 and openings M', andserves to hold ,the blocks from lateral displacement. f4lso this lockinglarrangement 'permits of the independent removal and replacement of anyof the blocks I', sov that incase of repair orA renewal it is onlynecessary to withdraw`the roduntil it is clear of the particular blockto be removed, after which the block can be removed froni'the supportingmember by drawing the same laterally o from the supporting member.

The support for the blocks comprises a plurality of substantiallyhorizontal prongs O projecting inwardly from the lower portion of theside plate G. These prongs extend into recesses O' inthe'blocks, thearrangement being such that the upper surface O2 of the blocks I will beheld against the lower surface O3 of the vertical wall H,

the rear portion of the upper face of the blocks however being recessedto receive the supporting plate member M. It will-be noticed that theinner face of the refractory blocks forms a continuation of the innerface of the vertical wall H, the latter being built up to the arch C.However in place of forming a tight connection between the blocks Q andthe arch, there is prefer-- ably a space Q left for expansion but i111air seal is formed'vertically between the sides of the arch and the faceR of the lblocks R. f

In a furnace constructed as above dey scribed, the passage of air fromthe space above the arch C to the combustion chamber, except through thetwyer members .I isy plrevented, 'and counter drafts avoided. oreoverthis advantageis obtai'neydvwitlifl out supporting the arch upon therefractory; wall. To permit of; the Iuse of the "saine"-y lower portionof the side plate dfor furnaces of kdifferent height, I` preferablyform" they.v side plates lGr in sections G and ,G,;

latter of which can be of any desired size.

Thus by a higher plate section G3, the,

arch C can be supported further away from makes such arrangementadvantageous while the saine standard lowersection 'G For sealing thespace above-*the Ya This floor 'is carried floor S is employed.

D, are a plurality flanges of 'the thereby. l .Y

Thus the entire arch, air twyers and proa, support y the grates, wherethe length'of thelfumad 'plate and tectingvertical -lwall lare soarranged Il they cali be Supported on the side-plate off h thefuelmgzine, .although the invention incertain of its aspects is notlimited supporting lthese members on the magazine sideplate. i v

Oneimportant advantage of the construc- `tion is that the flat arch(which is not a true arch but must have a suspensory support) issupported by metallic suspensory members which in turn are supported bymetallic members under the influence of the heat of the furnace butprotected fromtlie intense heat. It is a well knownz' fact that theco-eiiicient of expansion of metal and refractory material are quitedifferent so that if the metal were exposed to the same temperature asthe refractory the difference in the expansion would cause distortion inthe arch. On the other hand if the arch were supported on metal membersentirely out of the range of heat the expansion ofthe refractorymaterial without expansion of the metal would cause distortion. With myconstruction the metal supporting member is so located that it willexpand when the refractory material expands but being at a lesstemperature. This will compensate for the difference in the co-etiicientof expansion with the result that there will be' ver;1 littledistortion.

'hat I claim as my ,invent-ion is:

1. Ina furnace, the combination with a, furnace chamber, of a fiat archtherefor having a suspensory support, a side feed Stoker including a.side plate, and "a support for ysaid 4suspensory support carried by saidy side plate.

, 2. In a furnace, the combination with a. furnace chamber, of a flatarch therefor, a side 'feed Stoker-including a side plate and for v.saidflat arch carried by said `said side plate being formed in sidev plate,

lsect-ions?,to permit of the furnace arch being any desired height abovethe ,'bottomfo vlievv furnace chamber.

furnace, the combination with a ber, of a flat arch therefor havrysupport, aside feed stoker. a'y side plate, a support for said 'upportcarried by said side dv a vertical protecting wall also yisaid sideplate.

yiig-furnace, the combination with a ceclianiber, of a flat archtherefor havsuspensory support, a side feed stoker including, a sideplate,

and `a support for said suspensory support carried by said sidep1ate,'twyer members carried by said side a protecting vertical wallalso carried by said'side plate.

5. In a furnace, the combination with a furnace chamber. of a flat archtherefor, a

` side feed stoker including a side plate and a. support for.4 saidflat. arch carried by said side plate, twyer members carried by saidside plate and a protecting vertical wall also carried by said sideplate. a portion of said vertical wall being formed of independentlyremovable blocks. and a locking member for holding said blocks in alinedposition.

6. In a furnace. the combination with a furnace chamber. of a flat archtherefor having a suspensory support. a side plate, a verticalprotecting-wall carried by said side plate and extendingr upward to thearch member and arranged to form an air tight joint therewith, and meansfor supporting said suspensory support arranged adjacent to said sideplate and under the influence of the heat transmitted therethrough.

T. In a furnace. 'the combination with a. furnace chamber. of a flatarch therefor having a suspensory support. a side plate. a verticalprotecting wall spaced from said side plate. means for supporting saidwall from said side plate. said vertical wall having an offset portionforming an air tight joint with said arch. and means for supporting saidsuspensory support located to be under the influence of heat transmittedthrough said vertical wall.

8. In a furnace. the combination with a furnace chamber, of a flat. archtherefor, a side plate forming a support for said arch. a verticalprotecting wall spaced from said side plate, said vertical wall havingits inner portion arranged beneath but slightly spaced from a portion ofthe arc-h member. and said vertical wall having a portion forming avertical surface of contact with said arch.

9. In a furnace, the combination with a. furnace chamber, of a side feedstoker therefor having a side plate, twyer members carried by said sideplate, a Hatarch carried by said side plate, a. floor above said archspaced therefrom to leave an air space, and a vertical protecting wallcarried by said side plate and spaced therefrom to form an air passageconnecting the air above the arch with the twyer members.

10. In a furnace, the combination with a furnace chamber, of a flat archtherefor, a side feed Stoker including a side plate, a support for saidflat arch carried by said side plate, twyer members carried by said sideplate, a vertical protecting wall for said side plate, protecting blocksfor said air twyers and means for support-ing said blocks from said sideplate with theinner wall of the blocks substantially in alinement withsaid vert-ical wall.

11. In a furnace, the combination with a'.`

for said blocks and a locking member for removably holding said blocks'in position on said prongs.-

12. In a furnace, the combination with a furnace chamber and a sideplate, of twyer members carried by said side plate, inwardly extendingribs carried by said side plate, a plurality of refractory blocks alsosupported from said side plate, said blocks and ribs having registeringrecesses, and alocking rod extending into said recesses for removablyholding said blocks from lateral displacement.

13. In a furnace. the combination with a furnace chamber. of a.sectional side plate having the upper and lower sections, memberssupported b v said lower section. and an inner arch member supported bysaid upper Section.

14.. In a furnace. the combination with a furnace chamber, of a flatarch directly over said furnace chamber,` said arch comprising apluralityof independently supported membeis. suspensory supports forsaid members. and a. general support. for said arch carried by said sideplate.

15. In a furnace. the combination with a. furnace chamber, of a Hat archtherefor having a suspensory support, a side feed Stoker including aside plate, a protecting wall supported from said side plate. and meansunder the influence of heat radiated from said protecting wall forsupport-ing said suspensory support.

16. In a furnace, the combination with a furnace chamber, of a flat archtherefor, a side feed stoker including a side plate, means forsupporting said Hat arch from said side plate, and a. vertical wallhaving a plurality of independently removable blocks supported on saidside plate, and means for locking vsaid blocks from removal.

In testimony whereof I affix my signature.

EDWIN FITTS.

